My Blending is Leaking

I just purchased an Oster 4125 beehive blender whose lid is loose fitting (seems like they all are). I love the milkshake spinner blade function, wouldn't give it up. It even froths soy milk. Yay!

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The directions say to keep a hand firmly on the lid while blending, but this isn't helping the drips. The problem is that some of the liquid spatters out of the machine (I am using 1 c. liquid in a 5 c. blender cup).

Placing a dishtowel between the lid and the glass jar works, but is annoying. I am glad someone suggested it because this makes the item usable. I find that the square container froths with the milk shake blade more than the round container. So far, the round steel one isn't leaking nor spritzing all over the counter.